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SAE-AISI 5155 Steel vs. 2011A Aluminum

SAE-AISI 5155 steel belongs to the iron alloys classification, while 2011A aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is SAE-AISI 5155 steel and the bottom bar is 2011A aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
70
Elongation at Break, % 21
6.8 to 16
Fatigue Strength, MPa 260
75 to 100
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
26
Shear Strength, MPa 390
190 to 250
Tensile Strength: Ultimate (UTS), MPa 620
310 to 410
Tensile Strength: Yield (Proof), MPa 380
140 to 310

Thermal Properties

Latent Heat of Fusion, J/g 250
390
Maximum Temperature: Mechanical, °C 420
190
Melting Completion (Liquidus), °C 1450
660
Melting Onset (Solidus), °C 1410
550
Specific Heat Capacity, J/kg-K 470
870
Thermal Conductivity, W/m-K 49
130
Thermal Expansion, µm/m-K 12
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
33
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
96

Otherwise Unclassified Properties

Base Metal Price, % relative 2.1
11
Density, g/cm3 7.8
3.1
Embodied Carbon, kg CO2/kg material 1.4
7.9
Embodied Energy, MJ/kg 19
150
Embodied Water, L/kg 49
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
20 to 40
Resilience: Unit (Modulus of Resilience), kJ/m3 380
140 to 670
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
44
Strength to Weight: Axial, points 22
28 to 37
Strength to Weight: Bending, points 21
33 to 40
Thermal Diffusivity, mm2/s 13
49
Thermal Shock Resistance, points 20
14 to 18

Alloy Composition

Aluminum (Al), % 0
91.5 to 95.1
Bismuth (Bi), % 0
0.2 to 0.6
Carbon (C), % 0.51 to 0.59
0
Chromium (Cr), % 0.7 to 0.9
0
Copper (Cu), % 0
4.5 to 6.0
Iron (Fe), % 97.2 to 97.9
0 to 0.5
Lead (Pb), % 0
0.2 to 0.6
Manganese (Mn), % 0.7 to 0.9
0
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
0 to 0.4
Sulfur (S), % 0 to 0.040
0
Zinc (Zn), % 0
0 to 0.3
Residuals, % 0
0 to 0.15